Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32BG12P/EFR32BG12P433F1024IM68/ETM/ETMITATBCTR0#0x0
ETM Integration Test ATB Control 0 Register
ATVALID Output Value
https://github.com/cmsis-svd/cmsis-svd-data